ABCD

Example

A
A
A
24
B
B
B
15
C
A
C
_
15
_
15
 
 
A
B
C
_
_
_

Solution

A
A
A
24
B
B
B
15
C
A
C
12
15
21
15
 
 
A
B
C
8
5
2
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ABCD
ABCD

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